regex replace $1
You should consider the string "$1,$2" a format specifier that is used internally by the replace function to know what to do. It uses the previously tested regular expression, which yielded 2 results (two parenthesized blocks), and reformats th, $1--$9 是RegExp 自带的，只要放生了匹配就会有。 test exec str的replace 都会有。代表的是分组，即小括号里面的小正则捕获到的内容。, The replace method can take a function as the replacement parameter. For example: str.replace(/regex/, function(match, group1, group2, index, ..., You might also see the same thing as -1 , -2 , -3 in other regex engines, ... In your specific example, the $1 will be the group (^| ) which is ..., The following script uses the replace() method of the String instance to match a name in the format first last and output it in the format last, first. In the replacement text, the script uses $1 and $2 to indicate the results of the corresponding matchi,Problems to solve: Add () in pattern to get capture group; Pass input to replace method; Store result in variable (note: C# strings are immutable). Fixed code: , The nth parenthesized submatch string, provided the first argument to replace() was a RegExp object. (Corresponds to $1 , $2 , etc. above.) ..., $1 is a first captured group, and $2 is a second captured group. As David pointed, these values used in replacement patterns. string input ..., 取代模式會提供給具有 replacement 參數的Regex.Replace 方法 .... 例如，取代模式 $1 表示第一個擷取的群組將取代相符的子字串。For example ..., 在JavaScript 中，正規表達式也是物件，這些模式在RegExp 的exec 和test 方法中，以及String ... 用於取代(replace)的話，則是用$1, $2,...,$n。
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 regex replace $1 相關參考資料
How to explain "$1,$2" in Javascript when using regular expression ...
You should consider the string "$1,$2" a format specifier that is used internally by the replace function to know what to do. It uses the previously tested regular expression, which yielded... https://stackoverflow.com javascript - js正则表达式中replace的$0,$1是什么 ...
$1--$9 是RegExp 自带的，只要放生了匹配就会有。 test exec str的replace 都会有。代表的是分组，即小括号里面的小正则捕获到的内容。 https://segmentfault.com Javascript regexp: replacing $1 with f($1) - Stack Overflow
The replace method can take a function as the replacement parameter. For example: str.replace(/regex/, function(match, group1, group2, index, ... https://stackoverflow.com Javascript replace method, replace with "$1" - Stack Overflow
You might also see the same thing as -1 , -2 , -3 in other regex engines, ... In your specific example, the $1 will be the group (^| ) which is ... https://stackoverflow.com RegExp.$1-$9 - JavaScript | MDN
The following script uses the replace() method of the String instance to match a name in the format first last and output it in the format last, first. In the replacement text, the script uses $1 and... https://developer.mozilla.org Replacing text with regex using ".*" and $1 - Stack Overflow
Problems to solve: Add () in pattern to get capture group; Pass input to replace method; Store result in variable (note: C# strings are immutable). Fixed code: https://stackoverflow.com String.prototype.replace() - MDN - Mozilla
The nth parenthesized submatch string, provided the first argument to replace() was a RegExp object. (Corresponds to $1 , $2 , etc. above.) ... https://developer.mozilla.org What is $1 and $2 in Regular Expressions? - Stack Overflow
$1 is a first captured group, and $2 is a second captured group. As David pointed, these values used in replacement patterns. string input ... https://stackoverflow.com 在規則運算式中執行替代| Microsoft Docs
取代模式會提供給具有 replacement 參數的Regex.Replace 方法 .... 例如，取代模式 $1 表示第一個擷取的群組將取代相符的子字串。For example ... https://docs.microsoft.com 正規表達式- JavaScript | MDN
在JavaScript 中，正規表達式也是物件，這些模式在RegExp 的exec 和test 方法中，以及String ... 用於取代(replace)的話，則是用$1, $2,...,$n。 https://developer.mozilla.org |